class app.Shortcuts  $.extend @prototype, Events   constructor: ->    @isMac = $.isMac()    @start()   start: ->    $.on document, 'keydown', @onKeydown    $.on document, 'keypress', @onKeypress    return   stop: ->    $.off document, 'keydown', @onKeydown    $.off document, 'keypress', @onKeypress    return   swapArrowKeysBehavior: ->    app.settings.get('arrowScroll')   showTip: ->    app.showTip('KeyNav')    @showTip = null   onKeydown: (event) =>    return if @buggyEvent(event)    result = if event.ctrlKey or event.metaKey      @handleKeydownSuperEvent event unless event.altKey or event.shiftKey    else if event.shiftKey      @handleKeydownShiftEvent event unless event.altKey    else if event.altKey      @handleKeydownAltEvent event    else      @handleKeydownEvent event     event.preventDefault() if result is false    return   onKeypress: (event) =>    return if @buggyEvent(event)    unless event.ctrlKey or event.metaKey      result = @handleKeypressEvent event      event.preventDefault() if result is false    return   handleKeydownEvent: (event, _force) ->    return @handleKeydownAltEvent(event, true) if not _force and event.which in [37, 38, 39, 40] and @swapArrowKeysBehavior()     if not event.target.form and (48 <= event.which <= 57 or 65 <= event.which <= 90)      @trigger 'typing'      return     switch event.which      when 8        @trigger 'typing' unless event.target.form      when 13        @trigger 'enter'      when 27        @trigger 'escape'        false      when 32        if event.target.type is 'search' and (not @lastKeypress or @lastKeypress < Date.now() - 500)          @trigger 'pageDown'          false      when 33        @trigger 'pageUp'      when 34        @trigger 'pageDown'      when 35        @trigger 'pageBottom' unless event.target.form      when 36        @trigger 'pageTop' unless event.target.form      when 37        @trigger 'left' unless event.target.value      when 38        @trigger 'up'        @showTip?()        false      when 39        @trigger 'right' unless event.target.value      when 40        @trigger 'down'        @showTip?()        false      when 191        unless event.target.form          @trigger 'typing'          false   handleKeydownSuperEvent: (event) ->    switch event.which      when 13        @trigger 'superEnter'      when 37        if @isMac          @trigger 'superLeft'          false      when 38        @trigger 'pageTop'        false      when 39        if @isMac          @trigger 'superRight'          false      when 40        @trigger 'pageBottom'        false      when 188        @trigger 'preferences'        false   handleKeydownShiftEvent: (event, _force) ->    return @handleKeydownEvent(event, true) if not _force and event.which in [37, 38, 39, 40] and @swapArrowKeysBehavior()     if not event.target.form and 65 <= event.which <= 90      @trigger 'typing'      return     switch event.which      when 32        @trigger 'pageUp'        false      when 38        unless getSelection()?.toString()          @trigger 'altUp'          false      when 40        unless getSelection()?.toString()          @trigger 'altDown'          false   handleKeydownAltEvent: (event, _force) ->    return @handleKeydownEvent(event, true) if not _force and event.which in [37, 38, 39, 40] and @swapArrowKeysBehavior()     switch event.which      when 9        @trigger 'altRight', event      when 37        unless @isMac          @trigger 'superLeft'          false      when 38        @trigger 'altUp'        false      when 39        unless @isMac          @trigger 'superRight'          false      when 40        @trigger 'altDown'        false      when 68        @trigger 'altD'        false      when 70        @trigger 'altF', event      when 71        @trigger 'altG'        false      when 79        @trigger 'altO'        false      when 82        @trigger 'altR'        false      when 83        @trigger 'altS'        false   handleKeypressEvent: (event) ->    if event.which is 63 and not event.target.value      @trigger 'help'      false    else      @lastKeypress = Date.now()   buggyEvent: (event) ->    try      event.target      event.ctrlKey      event.which      return false    catch      return true